The Potomac River forms most of Maryland's western boundary.
The Potomac river
The Ohio River forms Ohio's southern border.
The southern half of the eastern boundary of Alabama is the Chattahoochee River.
Potomac River, for a short distance.
The Ohio River is the southern boundary of Ohio and Indiana.
The Ohio river is located on the southern boundary of Indiana and Ohio. The Ohio River also borders northern Kentucky.
The Ohio River forms Ohio's southern boundary. It serves as a natural border between Ohio and West Virginia, as well as Kentucky. This river is a significant waterway in the United States, flowing westward before joining the Mississippi River.
Ohio River
The Mississippi river forms the boundary between Missouri and Illinois!
The Ohio River forms the boundary between Indiana and Kentucky.
Ohio river